Ca ISOTOPE EFFECTS IN ORGUEIL LEACHATES AND THE IMPLICATIONS FOR THE CARRIER PHASES OF 54Cr ANOMALIES

被引：41

作者：

Moynier, Frederic ^{[1
]}

Simon, Justin I. ^{[2
]}

Podosek, Frank A. ^{[1
]}

Meyer, Bradley S. ^{[3
]}

Brannon, Joyce ^{[1
]}

DePaolo, Donald J. ^{[2
]}

机构：

[1] Washington Univ, McDonnell Ctr Space Sci, St Louis, MO 63130 USA

[2] Univ Calif Berkeley, Dept Earth & Planetary Sci, Ctr Isotope Geochem, Berkeley, CA 94720 USA

[3] Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 718卷 / 01期

关键词：

astrochemistry; nuclear reactions; nucleosynthesis; abundances; protoplanetary disks; HIGH-TEMPERATURE; NUCLEOSYNTHESIS; HETEROGENEITY; METEORITES; MURCHISON; CHROMIUM; EARTH;

D O I：

10.1088/2041-8205/718/1/L7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Primitive meteorites contain small Ca-40 excesses, in addition to rare anomalies in Ca-48. Refractory inclusions from Vigarano and Allende have larger Ca-40 and resolvable Ca-48 anomalies. These results imply that Ca isotopic heterogeneities were still present in the early solar system at both the mineral and whole-rock scale. The absence of correlated Ca isotope anomalies in leachates from the CI1 chondrite Orgueil containing large Cr-54 anomalies has implications on the origin of the Cr anomalies. Cr-54 has to be produced either in massive stars during s-process nucleosynthesis without accompanying Ca-48 or in particular zones in the rare Type Ia supernovae. In the latter case, Cr-54 has been produced in a zone predominantly enriched in Cr and Cr-54 and not mixed with other zones, or Cr-54 has been produced together with other neutron-rich nuclides and there has been subsequent decoupling of this material in the star, in the solar system, or in the laboratory.

引用

页码：L7 / L13

页数：7

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